Three years into owning my GT with tech package, i.e. Bose system and other electronic goodies, the Bose front subwoofer started to vibrate with a resonance like putting a coin on a speaker at a certain freuency.
After numerous head scratching and searching, I decided to take apart the door panel to see if there was a loose screw or something. To my surprise, the base of the Bose speaker where the membrane is attached to the speaker frame has rusted causing the membrane to separate from the frame!! The resonance came from the membrane vibrating freely at certain lower frequencies.
The fix? Used Epoxy cement to glue the membrane back with extra covering the frame to prevent from further moisture damage. So far its working, and the speaker sounded normal so far.
The bigger question is, after taking apart the door panel, I see that there is very little shielding material available to prevent moisture from getting to the components in the door panel, I know Mazda was trying to trim weight, BUT hey MAZDA this is unacceptable when moisture is damaging components causing problems.
Do anyone have similar issues? Post it here...